My carrier 58dxc is making a loud knocking noise and blowing out cold air. When I switch the thermostat to air the knocking stops and the unit works fine. It's only when I switch it to heat is when the knocking noise starts and the cold air comes out. Can anyone help.
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Re: My Carrier 58dxc is making a loud noise
If your turning on heat and the unit is knocking and blowing cold air, your compressor is having problems in heat mode, could be reversing valve. A tech is needed in your situation. Getting the prob fixed right away will save you dollars..
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check the thermostat also check the inline fuse for the electric heat coil . check wires in control panel they tend to burn and last check to make sure reversing valve is changing over located by the compressor
Unless I'm missing something in what you said, air conditioners are supposed to blow out cool air, rather than warm air. Or does the air just feel cooler than what you had the thermostat or comfort control set on? If that's the case, turn the comfort control or thermostat Up a bit.
Code 33 is "limit is open or flame switch is open"
FIRST make sure the filter is clean. Turn off unit then turn back on.
if it works but then later gives you a 33 code then you might have a dirty a/c coil (if you have a/c) that will cause the limit to open. 1st try that
That blinking light may be the diagnostic light. Count the blinks next time it fails. Carrier units will have two different blinks depicting the error code such as one blink followed by a pause than 3 blinks giving you an error code of 13. Then look at the wiring diagram, it will have an error code chart telling you where to start with your diagnosis. You already know that if you remove the cover it erases the error code, so look thru the small window first.
If it sounds like a scraping noise it could be the motor bracket ah broken and the squirrel cage (fan assembly) is hitting the fan housing, if it is more of a squeal than it very well could be a bearing. Very hard to guess without seeing or hearing it.
My weathermaker started making a screeching noise and intermittantly would shut down, without blowing any heat. I found the sediment trap clogged and the induction motor was churning through the backed up condensation water. This slowed the motor down and the pressure switch would not stay closed. Unclogging the trap and hoses solved the problem. A bunch of water came out when I disconnected the collector box drain hose, along with gobs of sticky crud. Works great and is quiet now.